Add initial logging system implementation

1 files changed, 70 insertions, 0 deletions

diff --git a/ncserver/base/log.py b/ncserver/base/log.py
new file mode 100644
index 0000000..053baec
--- /dev/null
+++ b/ncserver/base/log.py
@@ -0,0 +1,70 @@
+"""
+NETCONF for APK Distributions server:
+    Logging setup and routines.
+
+Copyright © 2020 Adélie Software in the Public Benefit, Inc.
+
+Released under the terms of the NCSA license.  See the LICENSE file included
+with this source distribution for more information.
+
+SPDX-License-Identifier: NCSA
+"""
+
+
+import logging
+
+from socket import gethostname
+from taillight import Signal
+
+
+HOSTNAME_CHANGED = Signal(('node_changed', 'sys:hostname'))
+"""The signal that will fire when the hostname is changed."""
+
+HANDLER = logging.StreamHandler()
+"""The root log handler."""
+
+LOG_AUTH = logging.getLogger('ncserver.auth')
+"""The authentication logger."""
+
+LOG_CONFIG = logging.getLogger('ncserver.config')
+"""The configuration logger."""
+
+LOG_OPERATIONAL = logging.getLogger('ncserver.operational')
+"""The operational logger."""
+
+
+def configure_format(hostname: str):
+    """Configure the formatter for the root log handler."""
+    fmt = logging.Formatter('%(asctime)s ' + hostname +
+                            ' %(name)s %(levelname)s: %(message)s',
+                            '%Y-%m-%dT%H:%M:%S')
+    HANDLER.setFormatter(fmt)
+
+
+def configure_logging(level: int):
+    """Configure the logging system."""
+    configure_format(gethostname())
+
+    root = logging.getLogger()
+
+    HANDLER.setLevel(level)
+    root.setLevel(level)
+
+    root.addHandler(HANDLER)
+
+
+
+HOSTNAME_CHANGED.add(configure_format)
+
+if not hasattr(logging, 'NOTICE'):
+    logging.addLevelName(25, 'NOTICE')
+    logging.NOTICE = 25
+
+    def log_notice(self, message, *args, **kwargs):
+        if self.isEnabledFor(25):
+            self._log(25, message, args, **kwargs)
+    logging.getLoggerClass().notice = log_notice
+
+    def root_notice(message, *args, **kwargs):
+        logging.log(25, message, *args, **kwargs)
+    logging.notice = root_notice